Wharncliffe Mill Bush Retreat Margaret River WA. Greywater Diversion System Wharncliffe Mill Bush Retreat has campsites and caravan sites set amongst the trees in their bush property. Catering for their guests’ needs, and taking care of their gardens, was putting too great a load on their mains water supply. Instead of an expensive upgrade to existing infrastructure, we designed an appropriate greywater diversion system coming off a renovated ablustions block. Recycling their wastewater works in tandem with the mains water and has allowed them to irrigate areas of revegetation and irrigate their gardens. Now their sites even shadier and it’s a better bush camping experience for everyone. Tags:Featured